How to script DEFINE_ADJUST UDF to execute for every nth fluent iteration?

- November 20, 2018 at 5:55 pm
  yk2359
  Subscriber
  Hello,
  
  Example FSI case:
  - Flow time (End time) 1 sec
  - Time step size 0.1 sec
  - System coupling iterations 10
  - Fluent iterations 5
  I am looking extract variables at the end of every 1 system coupling iteration (at the end of every 5 fluent iterations) using DEFINE_ADJUST UDF. Now I understand that adjust macro runs for every 1 fluent iteration, but is there any way to execute it only at every 5th? Or any other way? Please suggest.
  
  Thank you,
  
  YK
- November 20, 2018 at 6:20 pm
  
  Amine Ben Hadj Ali
  Ansys Employee
  
  Yes you can think about executing the content of the DEFINE_ADJUST whenever N_ITER%5 ==0
- November 20, 2018 at 6:54 pm
  
  yk2359
  Subscriber
  
  Thanks for the response. As N_ITER is a solver macro I believe I need not define it again.
  
  But while writing a parallel UDF, does if N_ITER%5 ==0{code} condition come under RP_NODE? !RP_HOST?
- November 20, 2018 at 8:04 pm
  
  Amine Ben Hadj Ali
  Ansys Employee
  
  I guess it will be available everywhere and passed to the node (so I generally put everything on nodes as host does not contain any mesh data) so make your UDF parallel as you have learned to do.
- November 21, 2018 at 5:55 am
  
  seeta gunti
  Ansys Employee
  
  You can hook the UDF for every 5 iterations and unhook the UDF after 1 iteration through calculation activities using TUI commands.
  
  Not sure if it works or not. Just an idea!
  
  Regards,
  
  Seeta